Journal of Food Hygiene and Safety (한국식품위생안전성학회지)

The Korean Society of Food Hygiene and Safety (한국식품위생안전성학회)
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Analysis of Transfer Rate on Listeria monocytogenes Contaminated Pork Meat During Processing

돈육 가공공정 중 돈육에 오염된 Listeria monocytogenes의 전이율 분석

  • Kim, Seong-Jo (Department of HACCP Promotion, Korea Health Industry Development Institute) ;
  • Kim, Gwang-Hee (Department of Food Science and Biotechnology, Kangwon National University) ;
  • Park, Joong-Hyun (Department of Food Science and Biotechnology, Kangwon National University) ;
  • Park, Bo-Geum (Department of Food Science and Biotechnology, Kangwon National University) ;
  • Park, Myoung-Su (Department of Food Science and Biotechnology, Kangwon National University) ;
  • Oh, Deog-Hwan (Department of Food Science and Biotechnology, Kangwon National University)
  • 김성조 (한국보건산업진흥원) ;
  • 김광희 (강원대학교 식품생명공학과) ;
  • 박중현 (강원대학교 식품생명공학과) ;
  • 박보금 (강원대학교 식품생명공학과) ;
  • 박명수 (강원대학교 식품생명공학과) ;
  • 오덕환 (강원대학교 식품생명공학과)
  • Received : 2012.07.24
  • Accepted : 2012.08.30
  • Published : 2012.12.31
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Abstract

In this study, the transfer rate of wild type Listeria mon, ytogenes (LM) was investigated to establish the standard of safety management during pork meat pr, essing for meat to meat and meat to food contact surfaces contamination at 5 and $10^{\circ}C$. The transfer rate of LM from meat to meat during the pr, essing increased from 0.02% after 30 min to 0.42% after 120 min at $5^{\circ}C$, while for conveyor belt and stainless steel, it decreased from 0.015% and 0.013% after 30 min to 0.002% and 0.0003% after 120 min at $5^{\circ}C$, respectively (p < 0.05). When temperature increased to $10^{\circ}C$, the transfer rates of LM from meat to meat, conveyor belt and stainless steel were the highest at 60 min exposure, and all decreased after 120 min. In reverse, the transfer rate from food contact surface to pork meat was significantly higher than that from pork meat to food contact surface (p < 0.01). Also, the transfer rate to conveyor belt was significantly higher than stainless steel (p < 0.05) and it was highest at 30 min exposure time in both 5 and $10^{\circ}C$. This study indicates that the transfer and adherence rates of LM are influenced by the contact time and temperature. Consequently, these results were utilized to develop a predictive model with a high level of confidence which can lead to prevent cross-contamination during pork meat processing.

Wild type Listeria monocytogenes 균주에 오염된 돈육으로부터 다른 돈육, 컨베이어벨트, 스테인리스 스틸로 일정시간(30, 60, 120분)동안 접촉시킨 후 $5^{\circ}C$와 $10^{\circ}C$에서 각각의 전이율을 조하였다. $5^{\circ}C$에서 돈육에서 돈육으로 L. monocytogenes의 평균 전이율은 30분에서 120분으로 시간이 지남에 따라 0.02%에서 0.42%로 증가하였고, 평균 전이율은 0.284%로 나타났다. 돈육에서 컨베이어 벨트와 스테인리스 스틸로의 평균 전이율은 30분 후 각각 0.05%, 0.002%의 전이율을 나타냈으나 120분 후에는 더욱 감소하여 0.013%, 0.0003%를 나타내었다(p < 0.05). 두 조건 모두 30분에서 가장 높은 전이율을 보였으나 120분 후에는 감소하였다. $10^{\circ}C$에서 돈육, 컨베이어벨트, 스테인리스 스틸 모두 60분에서 가장 높은 전이율을 나타냈지만 120분에서는 감소하였다. 반면에 식품접촉면에서 돈육으로의 전이율은 돈육에서 식품접촉면으로의 전이율 보다 높게 나타났다(p < 0.01). 시간대별로는 30분이 가장 높았으며, 시간의 경과에 따라 감소하였고 컨베이어벨트가 스테인리스 스틸보다 전이율이 높았다(p < 0.05). 상기의 결과로부터 돈육 공정과정의 오염원에 대한 미생물학적 계량모델을 제시하여 예측모델을 검증한 결과, 대부분의 전이율 예측모델이 신뢰도가 높게 나타났으며, 개발된 예측 모델은 교차오염 발생을 예방할 수 있을 것으로 기대된다.

Keywords

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